嘗試啟動MapKit位置更新，而無需使用Objective-C在ios 9中提示位置授權

Question

我試圖在iOS 8上使用MapKit，但不斷收到錯誤消息：

Trying to start MapKit location updates without prompting for location authorization. Must call   
-[CLLocationManager requestWhenInUseAuthorization] or -[CLLocationManager 
requestAlwaysAuthorization] first. 

在這里查找，我發現我必須在plist中實現NSLocationWhenInUsageDescription，但是什么也沒有發生，並且在控制台中仍然出現該錯誤。 我究竟做錯了什么？

Answer 1

1.-將以下行添加到您的info.plist

<key>NSLocationWhenInUseUsageDescription</key>
<string>The spirit of stack overflow is coders helping coders</string>

<key>NSLocationAlwaysUsageDescription</key>
<string>I have learned more on stack overflow than anything else</string>

2.-提示位置授權：

 if ([self.locationManager  respondsToSelector:@selector(requestAlwaysAuthorization)]) {
               [self.locationManager requestAlwaysAuthorization];

3.-當用戶接受后更新位置...

   - (void) locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status{

        if (status == kCLAuthorizationStatusAuthorizedAlways || status == kCLAuthorizationStatusAuthorizedWhenInUse) {
            [self.locationManager startUpdatingLocation];

    }
}

Answer 2

只需在CLLocationManager初始化中添加這些代碼即可。

例如： @property (strong, nonatomic) CLLocationManager *locationManager; 然后在您的實現中只需調用[self.locationManager requestWhenInUseAuthorization]; 在調用更新函數之前。

Answer 3

在您的cllocationmanager初始化之后，檢查ios 8並尋求許可

locationManager = [[CLLocationManager alloc] init];// [[[CLLocationManager alloc] init] autorelease];
    locationManager.delegate = self;
    // Check for iOS 8. Without this guard the code will crash with "unknown selector" on iOS 7.
    if ([locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) {
        [locationManager requestWhenInUseAuthorization];
    }

參考http://nevan.net/2014/09/core-location-manager-changes-in-ios-8/

Answer 4

除了在PList中實現鍵（我具有NSLocationWhenInUseUsageDescritpion和NSLocationWhenInUseUsageDescritpion Privacy - Location Usage Description ）之外，我還使用以下代碼解決了警告：

if ([CLLocationManager locationServicesEnabled])
{
    CLAuthorizationStatus status = [CLLocationManager authorizationStatus];
    if (status == kCLAuthorizationStatusRestricted || status == kCLAuthorizationStatusDenied || status ==  kCLAuthorizationStatusNotDetermined) {
    } else {
        _mapView.showsUserLocation = YES;
    }
}